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I have always problem with keeping my thicker music books opened on music stand especially when they're new. They are stiff and closing by itself if not held so I thought maybe some giant clip would help? Anybody using something like that?

I put a clip on each lower RH corner of the book, then wedge the clip behind the lip of the music desk so the book can't go anywhere.This may be done in addition to using the clip at top center that looks like the letter m.Seems to work like a charm.

I have a couple of those clothespin/chopsticks hybrid clips and they're awesome. I used to use regular old fashioned wooden-clippy clothespins before that, but once I got the extended version, I never looked back. Another good quality of the fancy kind is they have a transparent front, so one can see the music through them if necessary.

Also helpful to make sheet music stay open is to do an old-fashioned "book opening", especially with perfect bound books of scores. Back in the day, they taught us how to do this in school, but today it seems to be a lost art. Here's an illustration courtesy of AbeBooksAnd here's another version

ETA: The book-opening thing works best if you do it first thing, before the book gets "trained" to want to open at one (or more) particular places.